California Code
ARTICLE 2 - Permits
Section 6066.4.

6066.4. A city, county, or city and county may require each person desiring to engage in business in that jurisdiction for the purposes of selling tangible personal property to provide his or her seller’s permit account number, if any.

(Amended by Stats. 2003, Ch. 471, Sec. 21.1. Effective January 1, 2004.)